Answer
perimeter = 30 cm
Work Step by Step
RECALL:
The perimeter of a polygon is equal to the sum of the lengths of all its sides.
Add the lengths of all the sides to find the perimeter:
perimeter = $3+12+3+12= 30$ cm
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 10 - Geometry - 10.3 Polygons, Perimeter, and Tessellations - Exercise Set 10.3 - Page 636: 11
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